Car-ventilator.



no MODEL.

No. 772.355. PATENTBD OUT. 18, 1904 M. H. HIRSHON.

v GAR VENTILATOR. APPLICATION FILED AUG. 15. 1902.

Fig.1

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Witnesses:

77% gom w UNITED STATES Patented October 18, 1904.

PATENT OFFICE.

I MORRUS HNHIRSHON, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO CHARLES F. A. SMITH,OF BOSTON, MASSACHUSETTS.

CAR-VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 772,355, dated October 18, 1904.

- Application filed August 15, 1902. Serial No. 119,739. (No model.)

T0 at whom, it may concern:

Be it known that I, MORRUS H. HIRSHON, a citizen of the United States,- residing at Cambridge, in the county of Middlesex and Commonwealth of Massachusetts, have invented an Improvement in Car-Ventilators, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

My invention relates to improvements in ventilators particularly adapted to the ventilation of street and road cars, and it relates to that type of ventilator in which drafts of outside air acting on the suction principle withdraw the foul air out through the ventilator. The ventilator may also be used on boats, houses, or other buildings in any-case where a ventilator is required. The ventilator, as shown in the drawings, may be applied to the top portion of the'car and with slight changes in the construction, as explained hereinafter in the specification, may be applied to the side or any other portion of the car found most convenient, and as street and railway cars ordinarily run to and fro without reversal I have provided a double-ended construction permitting the ventilator to operate with equal facility in whichever direction the car may be running without readjustment of any part of the ventilator. As the ventilator is stationary in position on the car, the fastening means may be of any kind, and accordingly I have confined myself in the specification and the drawings to that portion of the ventilator tion will now be given in connection with the accompanying drawings, and I attain my object by the mechanism there illustrated, showing such preferred construction, and the features forming the invention will then be specifically pointed out in the claim.

Fig. 1.

In said drawings, Figure l'represents a longitudinal sectional view on the line 1 1 of Fig. 2 of one embodiment of my invention. Fig. 2 is a plan view of the ventilator with the outside casin'g shown in section on the line 2 2 of Fig. 3 is a sectional view on the line 3 3 of Figs. 1 and 2.

Like letters of reference indicate corresponding parts in the different figures of the drawings.

In the invention there are three parts, as shown by the drawings, the parts A and B being at right angles to the thimble or neck portion C, the foul air passing upward through the thimble C into the part A, thence being sucked out into the part B through the perforations in the part B by a draft of air passing through the part B in either direction.

. If desired, the conical-shaped mouths of the part B may have attached flaring mouths b 6, capable of gathering in the air and creating a powerful suction, the suction of air beingfrom the larger or outer part A, through the perforated holes in the upper half of the drum of the part B, into the inner part of thedrum, and thence out of one of the mouths of the drum or part B. Ihave found by experimenting that it is best that the perforations extend only about half-way round the drum on the upper part. If the perforations are in the lower part of the drum, the result is opposite from what is desired and there is more or less suction-inward of cinders and other foreign matter, es-

pecially smoke, when the ventilators are used on steam-trains. It will be seen by examining Fig. 3 that the lower half of drum is free of any opening or perforation and is further provided with the two wings or projecting pieces cl d, which extend outward and upward from the outer side of the drum, commencing just below the lower perforations. As these wings are on the outer side of the part B and within the part A, they are invisible to the ey when looking into the ventilator through either mouth of the part B and are only visible when looking upward into the part A through the thimble C. The lower line of these wings is straight, but flares or extends upward, as shown in Fig. 2. The object of these wings is to deflect any fine cinders or particles of dust that might pass into the part A through the foraminous surface of the drum, especially during damp weather. These particles are held by these wings and are sucked out again into the part B and thence outward. The part B, therefore, as shown in the drawings, consists of the drum, having its lower part free from perforations, its upper part perforated, wings attached to the outer part of drum, and conical shaped mouths somewhat larger than the drum to cause a proper suction and when desired additional mouth parts for greater suction; but it is in no case desirable that the part A extend outward beyond the outer ends of the mouths proper of the part B. The part B is preferably cylindrical, and the part A is preferably conical, extending upward toward its center and away from the outer ends of the mouths of the part B and is provided with an opening in its lower part for connecting the part C. When it is desired to attach the ventilator to the side of a car, it is necessary that the part B, which is nearly the shape of an ordinary spool, be turned one-quarter-way round, so that the perforated half of the drum will be upward.

The difli'erent parts may be changed somewhat in their shape to allow of being inserted in different spaces; but the preferred construction shown will always be found desirable when space will permit.

It is necessary,

however, that the construction be so as to allow a free circulation of air in the part A around the part B and thence through perforations into the drum and out its mouths.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- A ventilator of the kind described comprising an outlet-pipe provided at its upper end with a double-ended hood containing a drum, the upper part of which is foraminous so that gases passing up the outlet-pipe must first pass around the drum into the upper part of the double-ended hood before passing out through the holes in the drum and the drum being provided at each end with conicalshaped mouths within the double-ended hood and securing it thereto so that a portion of the gases passing up from the outlet-pipe pass around the conical mouths of the drum, and the drum being provided on each side immediately below the foraminous part with wings extending on an incline upward to deflect gases coming up the outlet-pipe to the upper part of the cylinder, said wings extending from one conical mouth to the other mouth, substantially as shown and described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

MORRUS H. HIRSHON.

Witnesses:

CHARLES F. A. SMITH, FRANcIs E. SMITH. 

